<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login Page</title>
    <!-- 引入 Bootstrap CSS -->
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" rel="stylesheet">
    <!-- 自定义样式 -->
    <style>
        body {
            padding-top: 5rem;
        }
        .login-container {
            max-width: 400px;
            margin: auto;
        }
    </style>
</head>
<body>
<div class="container login-container">
    <div class="card">
        <div class="card-header">
            Login
        </div>
        <div class="card-body">
            <form id="loginForm">
                <div class="form-group">
                    <label for="username">Username</label>
                    <input type="text" class="form-control" id="username" placeholder="Enter username" required>
                </div>
                <div class="form-group">
                    <label for="password">Password</label>
                    <input type="password" class="form-control" id="password" placeholder="Password" required>
                </div>
                <button type="submit" class="btn btn-primary">Login</button>
            </form>
        </div>
    </div>
</div>

<!-- 引入 Bootstrap JS 和依赖的 jQuery 和 Popper.js -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.3/dist/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
<!-- 自定义 JavaScript -->
<script>
    document.getElementById('loginForm').addEventListener('submit', function(event) {
        event.preventDefault(); // 阻止表单默认提交行为
        var username = document.getElementById('username').value;
        var password = document.getElementById('password').value;
        console.log('Username:', username, 'Password:', password); // 打印用户名和密码，实际应用中应避免如此操作
        // 这里可以添加 AJAX 调用或其他 JavaScript 逻辑处理登录
        alert('Login button clicked. Check console for username and password.'); // 简单的提示信息
    });
</script>
</body>
</html>
